I've found magicians on Facebook. Social networking is up to the individual. Some accept just about any friend invite, others are very selective. The rule of life is: it doesn't hurt to ask. If they do not accept you, then you are right where you started, so you have nothing to lose.
I have connected with magicians who I know or simply met once in real life. When I found out that they were friends with a magician I wanted to meet, I just sent an invite and most responded by accepting.
Don't be afraid to ask. If you are courteous and not a stalker you have nothing to worry about

. Some won't accept, others will. The only way to make friends is to get out there and be friendly.
Most magicians are very cool to other magicians.